30/11-6 S
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General information
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Wellbore history
GeneralWildcat well 30/11-6 S is located on the Bj ørgvin Arch in the Northern North Sea, between the Frigg Area and the Oseberg S ør area. The primary objective was the hydrocarbon potential in sandstones within the Upper and Middle Tarbert Formations in the Brent Group. The secondary objectives were to investigate the remaining part of the Brent Group and the Lower Heather Formation, to secure seismic tie by shooting VSP, and to obtain pressuremeasurements for regional understanding and evaluation of internal pressure barriers within the Brent Group.Operations and resultsWell 30/11-6 was spudded with the semi-submersible installation Deepsea Delta on 3 June 2004 and drilled to TD at 3550 m in the Early Jurassic Drake Formation. No significant problems were reported from the operations. The well was drilled with seawater and pills of bentonite spud mud down to 1415 m and with Glydril KCl/polymer mud from 1415 m to TD.The well penetrated Lower Heather, Upper Tarbert (Tarbert 3), Middle Tarbert (Tarbert 2), Lower Tarbert (Tarbert 1) and Ness Formations of the Brent Group. The formation tops were encountered somewhat deeper than the prognosis. The reservoir quality was slightly better than expected. The well did not prove any commercial hydrocarbons, although good oil shows were obtained in Upper and Middle Tarbert Formation. Three conventional cores were cut, covering parts of Upper Tarbert, Middle Tarbert and parts of Lower Tarbert Formation of the Brent Group. The cores showed variable reservoir quality, but contained several reservoir units of good quality. The best reservoir zone was found within the upper parts of Middle Tarbert. The wire-line program was performed according to dry hole scenario, without MDT sampling, MSCT and the FMI wire-line logs in the 8 1/2" section.The well was permanently abandoned on 2 July 2004 as a dry well with shows.TestingNo drill stem test was performed -
Cuttings at the Norwegian Offshore Directorate
Cuttings at the Norwegian Offshore Directorate Cuttings available for sampling?YESCuttings at the Norwegian Offshore Directorate Cutting sample, top depth [m]Cutting samples, bottom depth [m]1480.003550.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13196.03214.4[m ]23214.43269.0[m ]33269.03299.0[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]103.0Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit132574749227022702337245725652639263928462956295629612961299331503150331134973497 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]MDT GR30913469MWD - DIR132229MWD - GR RES DIR2102413MWD - GR RES DIR PRES22893550SP HRLA PEX MSI ECS21003550VSP GR13673530 -
Casing and leak–off tests
Casing and leak–off tests Casing typeCasing diam.
[inch]Casing depth
[m]Hole diam.
[inch]Hole depth
[m]LOT/FIT mud eqv.
[g/cm3]Formation test typeCONDUCTOR30229.036229.00.00LOTSURF.COND.13 3/81408.017 1/21415.01.83LOTINTERM.9 5/82695.012 1/42700.01.87LOTOPEN HOLE3550.08 1/23550.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured1320.00seawater14151.30waterbased27001.45Glydril WBM35501.45Glydril WBM -
Pressure plots
Pressure plots The pore pressure data is sourced from well logs if no other source is specified. In some wells where pore pressure logs do not exist, information from Drill stem tests and kicks have been used. The data has been reported to the NPD, and further processed and quality controlled by IHS Markit.Pressure plots Document nameDocument formatDocument size [MB]pdf0.24